Ask for 5th grade fun math problems, about 10 questions? 30

1.There are 100 monks who eat 100 steamed buns, 1 big monk eats 3, 3 small monks eat 1, ask how many big monks and how many small monks?

2.The fruit shop bought a batch of fruits, in which pears weigh three times as much as grapes, and sold 25 kilograms of grapes and 60 kilograms of pears every day. When all the grapes were sold, there were still 75 kilograms of pears. How many kilograms did the grapes originally weigh?

3.The number of students in Class A and Class B is equal, and some students from each class participate in the activity. The number of A ginseng is one-third of that of B, and the number of B ginseng is one-quarter of that of A's non-ginseng.

Xiao Ming's average score in the four subjects of Chinese, Mathematics, Foreign Language and Geography is not less than 90 points, (each subject is an integer and the full score is 100 points).It is known that his geography score is 5 6 in mathematics, 11 10 in Chinese and 10 points higher than in Chinese, so what is the score in mathematics?

5.From school to home, the elder brother needs to walk 16 minutes, the younger sister needs to walk 24 minutes, if the younger sister starts from school 2 minutes, the older brother starts from home, the brother and sister walk 120 meters more than the younger sister when the brother and sister meet.

How far is school to home?

6.A and B each have a number of saplings, after A gives 20% to B, B gives 25% to A, at this time they each have 180 trees, how many saplings does A and B have?

7.Processing a batch of parts, A and B can be completed in 24 days of cooperation, now A first does 16 days, and then B does another 12 days, there are still 2 5 of this batch of parts are not completed, it is known that B processes 3 more than A every day, how many parts are there in this batch?

8.Each of the three warehouses of A, B and C has a batch of grain storage, the grain in warehouse A is 2 5 of the total amount of the three warehouses, the grain in warehouse B is 1 4 more than that in warehouse C, the difference between warehouse A and warehouse B is 10 tons, how many tons of grain is stored in warehouse A, B and C 3 warehouses?

9.For the first time, 2/5 of the total length of an iron wire is used, and the second time it is 14 meters, and the ratio of the rest to the length used is 3:1How many meters was this wire originally long?

10.Fourth-grade students underwent a physical examination, and there were 5 students who weighed no more than 50 kilograms, but the weight of the scale could only weigh more than 50 kilograms, and the teacher arranged two and weighed once, a total of ten times, and the weight was recorded as follows5 kg, find the weight of the heaviest one.

1 question. Big monk x small monk y 3x + y 3 1 = 00

x+y=100 gives x=25y=75

1.Each of the five cards has numbers written on them: 0, 0, 1, 2, 3, and you can use them to form many different five-digit numbers to find all these five-digit numbers. How much.

And. Go up the stairs together, the speed is.

2 times the speed of asking: when.

When you go up to the fourth floor, go up to the ( ) floor.

3 A weed that grows twice as tall every day and grows to 4 in 12 days

When this weed grows to 6 mm, it takes ( ) days.

4 Xiaoqiang has two packets of candies, one with 48 grains and the other with 12 pills, he takes out 3 grains from the more packet at a time, puts them in the less packet, and after ( ) times, the number of grains in the two packets of candy is equal.

5 Immediately after 4444 write a string of numbers, and each number written down is a single digit of the product of the two numbers in front of it. For example: 4 4 = 16, write 6 after 4, 4 6 = 24, and write 4 ,...... after 6Get a string of numbers:

4444644644……, the string of numbers starts from 1 and counts to the right, and the 4444th digit is ( ).

6 Mommy is in.

Above. Eggs have to be fried on both sides, it takes 30 seconds to fry each side, you can only fry two eggs at the same time on this pan, now you need to fry three eggs, it takes at least ( ) seconds.

7 And there were two heaps of fruit, a heap of apples and a heap of pears. If you exchange 1 apple for 1 pear, then there are 2 more apples, if you exchange 1 pear for 2 apples, then there is 1 more pear, think about it, there are ( ) apples, ( pears.

8.When a road is built, there are still kilometers left to be repaired, and it is known that there are more than half of the roads that have not been repaired. The total length of this road is ( ) km.

9.A barrel of oil weighs kilograms, and after half of the oil is used, the barrel weighs grams. This Oak Boy Xiang barrel oil.

Kilogram. Produce a batch of pesticides, tons per day. If the price per 500 grams is yuan. The value of pesticides produced by this plant per day is ( ) yuan.

11.Known A, B, C, Qiwu

None of the numbers are zero, and I know:

A number B = D number B = C number B number.

A number C number.

Compare A, B, C, and more

The size of the number is in descending order, and the third place is ( ).

12.The number in the 100th place after the decimal point is ( ).

15.There are three people, A, B, and C, A walks 50 meters per minute, B walks 40 meters per minute, and C walks 60 meters per minute. A and B from.

Third. At the same time, they set off and walked in relative directions. A meets C 40 minutes after departure, and Liang Bo B meets C after setting off ( ).

One. People take cats, chickens, and rice across the river, and the boat can carry at least one of the three cats, chickens, and rice in addition to people rowing, and when people are not present, cats should eat chickens, and chickens should eat rice. Try to design a safe river crossing scheme and minimize the number of ferries.

Answer: 1 Take the chicken over and come back empty-handed.

2 Bring the cat over and bring the chicken back.

3 Bring the rice over and come back empty-handed.

4 Bring the chickens over.

4 There is a monkey in the forest to pick 100 bananas into a pile, the monkey's house is 50 meters away from the banana pile, the monkey intends to carry the banana home, each time can carry up to 50, but the monkey is greedy, every meter to eat a banana, ask the monkey can carry home a few incense sticks at most.

Banana? 25 roots.

Carry 50 to 25 meters first, at this time, eat 25 roots, and 25 roots, put down. I went back and carried the remaining 50 sticks, and when I got to 25 meters, I ate another 25 sticks, and there were 25 more. Then pick up 25 on the ground, a total of 50, continue to walk home, a total of 25 meters, A, B, C three people invested 550,000 yuan to set up a store.

1 5 of the total investment of A, and the rest shall be borne by B and C, and B will invest 20% more than C. How much does B invest? 2. When the sun sets on the western slope, the ducks quack into the nest.

A quarter of the shore goes forward, half and half with the waves; There are eight ducks behind me, how many ducks are there in my house?

9 trees in 10 rows, 3 in each row, ask how to plant?

The method of a bad class 2525

1.There are 9 trees, and you need to plant 10 rows, 3 in each row, please help.

According to the title, if there are 3 trees in each row, it seems that 30 trees are needed to plant 10 rows. However, there are now only 9 of them. From this, it follows that at least some trees should be planted at the intersection of several rows (mathematically called emphasis).

To do this, we can design 6 triple points (3-row intersections) and 3 4-key points (4-row intersections).

2.A tree is eight meters high, and a person climbs up four meters every minute and falls down another three meters, asking how many minutes can he reach the top of the tree?

3.Grandpa said to Xiaojun: "My current age is 7 times your age, in a few years it will be 6 times your age, and in a few years it will be 5 times, 4 times, 3 times, and 2 times your age." "How old are Grandpa and Xiaojun now?

Grandpa said to Xiaojun: "I am now 7 times your age".

Then Grandpa's age is now a multiple of 7.

There is a multiple of 7 within 100.

Since this is a practical problem.

Grandpa's age is to consider the 5 numbers 56, 63, 70, 77, 84.

Then the age of the corresponding Xiaojun is 8, 9, 10, 11, 12

Grandpa, who has been X years old, is 6 times older than Xiaojun.

The column equation (8+x)*6=56+x is solved so that x is not an integer, so Xiaojun is 8 years old and this answer is excluded.

The column equation (9+x)*6=63+x solves that x is not an integer, so the answer that Xiaojun is 9 years old is excluded.

The column equation (10+x)*6=70+x is solved x=2, so the answer of Xiaojun 10 years old can be considered.

The column equation (11+x)*6=84+x solves x is not an integer, so Xiaojun is 11 years old and this answer is excluded.

In fact, as long as the current grandfather's age minus 6 times the age of Xiaojun, it is a multiple of 10, and the conditions are met

So now there is the answer Xiaojun is 10 years old and Grandpa is 70 years old.

Then we verify the known conditions.

Grandpa who has been set to be X years old is 5 times the age of Xiaojun.

The column equation (10+x)*5=70+x is solved to x=5

Grandpa who has been X years old is 4 times older than Xiaojun.

The column equation (10+x)*4=70+x is solved to x=10

Grandpa who has been X years old is 3 times the age of Xiaojun.

The column equation (10+x)*3=70+x is solved to x=20

Grandpa, who has been X years old, is twice as old as Xiaojun.

The column equation (10+x)*2=70+x is solved to x=50

Final answer. Grandpa is now 70 years old and Xiaojun is 10 years old.

After 2 years, grandpa is 6 times older than Xiaojun.

After 5 years, grandpa is 5 times older than Xiaojun.

After 10 years, grandpa is 4 times older than Xiaojun.

After 20 years, my grandfather's age is 3 times that of Xiaojun.

After 50 years, my grandfather is twice as old as Xiaojun.

There are a few more that can't be pulled down, see for yourself.